题目内容：

根据英语解释写出相应的单词
Someone who studies or works in biology .the force that cause something to fall to the ground or to be attracted to another planet .the typical weather conditions in a partieulcs area .very difficult to believe and therefore probably untrue .a thin paper cover in which you put and send a letter 共五句五个单词

优质解答

No.1 biologist (生物学家）
No.2 gravity （重力,引力）
No.3 climate （气候）
No.4 unbelievable (难以置信的,不真实的）
No.5 envelope (信封)
注：可能还有其他的单词也可以如此翻译